The Tor Browser / file comparison
comparison: addon-sdk/source/lib/sdk/preferences/event-target.js
addon-sdk/source/lib/sdk/preferences/event-target.js
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:0750e7ec7aaa |
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 'use strict'; | |
| 5 | |
| 6 module.metadata = { | |
| 7 "stability": "unstable" | |
| 8 }; | |
| 9 | |
| 10 const { Cc, Ci } = require('chrome'); | |
| 11 const { Class } = require('../core/heritage'); | |
| 12 const { EventTarget } = require('../event/target'); | |
| 13 const { Branch } = require('./service'); | |
| 14 const { emit, off } = require('../event/core'); | |
| 15 const { when: unload } = require('../system/unload'); | |
| 16 | |
| 17 const prefTargetNS = require('../core/namespace').ns(); | |
| 18 | |
| 19 const PrefsTarget = Class({ | |
| 20 extends: EventTarget, | |
| 21 initialize: function(options) { | |
| 22 options = options || {}; | |
| 23 EventTarget.prototype.initialize.call(this, options); | |
| 24 | |
| 25 let branchName = options.branchName || ''; | |
| 26 let branch = Cc["@mozilla.org/preferences-service;1"]. | |
| 27 getService(Ci.nsIPrefService). | |
| 28 getBranch(branchName). | |
| 29 QueryInterface(Ci.nsIPrefBranch2); | |
| 30 prefTargetNS(this).branch = branch; | |
| 31 | |
| 32 // provides easy access to preference values | |
| 33 this.prefs = Branch(branchName); | |
| 34 | |
| 35 // start listening to preference changes | |
| 36 let observer = prefTargetNS(this).observer = onChange.bind(this); | |
| 37 branch.addObserver('', observer, false); | |
| 38 | |
| 39 // Make sure to destroy this on unload | |
| 40 unload(destroy.bind(this)); | |
| 41 } | |
| 42 }); | |
| 43 exports.PrefsTarget = PrefsTarget; | |
| 44 | |
| 45 /* HELPERS */ | |
| 46 | |
| 47 function onChange(subject, topic, name) { | |
| 48 if (topic === 'nsPref:changed') { | |
| 49 emit(this, name, name); | |
| 50 emit(this, '', name); | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 function destroy() { | |
| 55 off(this); | |
| 56 | |
| 57 // stop listening to preference changes | |
| 58 let branch = prefTargetNS(this).branch; | |
| 59 branch.removeObserver('', prefTargetNS(this).observer, false); | |
| 60 prefTargetNS(this).observer = null; | |
| 61 } |
